Alarm system



Nov. 4z3 192e. 1 sos 201 I J. M. COBURN ET AL ALARM SYSTEM Filed March 2, 1922 Patented Nov. 23, 1926.

UNUSED STATES i raam Partnr caries.

JOHN M. COBURN AND JOHN lvI. MCCRARY, OF LONG BEACH, CALIFORNIA.

ALARM SYSTEM.

Application filed March 2, 1922.

This invention relates to alarm systems, and particularly to an alarm the switch mem er ol which is adapted to operate in conjunction with a door lock. rl`he invention has ior an object the provision of a suitable alarm system which is simple in construction and which may be easily installed and will operate in a positive manner when so installed.

ln practicing the invention we provide a suitable switch member which may be placed in a door jamb and which switch member may be locked open or closed so as to operate when the main lock ol the door is disturbed. The switch member may in turn operate various devices such as a light or an audible alarm ot' some torni to call at tention to a transgression of some person unlawfully upon the premises in an attempt to force an opening through the door.

lVith the above and other objects in view, the invention consists in the novel and usei'ul provision, formation, construction, combination, association and relative arrangement of parts, members and features, as illustrated in some ot its embodiments in the accompanying drawing, described in the following detail description, and linally pointed out with particularly in claims..

In the drawing:

Figure l is a fragmentary View, `certain parts being in section, ot' a switch member adapted to be placed in a door jamb and to operate in conjunction with the lock bolt for the door, said figure likewise illustrating a wiring diagram for operating a light and bell member when the switch member is closed;

Figure 2 is a view similar to Figure l, showing the switch member closed;

Figure 3 is a fragmentary cross sectional View showing the switch member held in an operative position, the said view beingan enlargement ot details shown in Figure l;

Figure 4 is a fragmentary cross sectional view taken on the line 4 4 of Figure 3 and looking in the direction of the appended arrows; and

Figure 5 is a fragmentary cross sectional view taken on the line 5 5 of Figure 3 and looking in the direction of the appended arrows.

Corresponding parts in all the ligures are designated by the same reference characters.

Referring with particularity to the draving, A designates in its entirety a switch serial no. 54131550.

member for operating various alarm devices, such as a light a, or an audible member b, or both together. The said switch A includes a casing l provided with an annular flanged end 2 adapted to hold an annular plate member 3. The base 4 of said casing may be flat, as shown in Figures 4 and 5, while the remaining portion thereof may be curved as shown in said figures. rThis is slmply a matter ot preference. l/Vithin the casing 1 is a stem or bolt 5 which passes through an opening in the plate 3 and likewise through an opening in an end 6 ot the casing. The bolt 5 may be irregular in cross section and the opening in the end 6 likewise irregular so as to act as a guide for the bolt during movement thereof. One end of the bolt, as 7, carries Contact fingers or arms 8. These contacts arms, dependent upon mov-ement of the bolt 5, may cont-act with posts 9, as illustrated in Figure 2. The posts 9 are provided with insulated portions l0 confined within openings between the annular flange end 2 and the plate 3. The casing 1 is adapted to be placed in a door jamb 0 in such a position that an end 11 Vof the bolt 5 may contact at certain times with a lock bolt 12 in a door 13. Assuming that th-e door jamb has been suitably recessed tor reception ot the casing 1, the bolt 5 is so arranged that it may be locked in various positions relative to the casing 1, and this locking is accomplished in the following manner: Normally a coil spring 14V surrounds the bolt5 and has one end abutting against the plate 3, while an opposite end of the spring engages a pin 15 passing transversely through the bolt 5. The spring being under compression will immediately move the bolt when the bolt 5 is released so that the contact arms or Vfingers 8 may engage the posts 9. Movementl ot the i bolt 5, however, may be restrained by` suitable means CZ, which may be a detent,'as well as by means e. The means Z may be pivoted as at 16 and movable within a slot 17 in the base 4. A spring member 18 normally urges the means CZ upwardly to where it may engage the walls surrounding a notch 19 ad] acent the end 11 of the .bolt 5. The means l may be provided with a pin g to limit the upward movement thereof. rihis isy illus-4 trated best in Figure 3. Obviously the detent or means d by engaging either an end, or the notched portion 19, will prevent movement in one direction of the bolt 5. The base 4 is provided with an extension casing 2O for confining the spring 1S and a portion of the means d, as illustrated in Figures 1 and 2. The bolt 5 is likewise provided with an inclined surface or cam surface 21 ranging from the notch 19. Jlssuming that the bolt 5 has been pushed inwardly so that the contact arms are spaced 'from the Contact posts 9, and that the means Z is engaging the notch 19 and holding the bolt in such a position, locking the door, that is, passing the bolt 12 within the door jamb, will cause said bolt 12 to engage an edge ot the means d forcing it downwardly so that the means (Z will disengage the notch 19, whereupon the bolt 12 will engage the end 11 ot the bolt rlhis is illustrated in Figure 1. la, now, the look were turned in the door 13, outward move- Vrent of the bolt 12 with respe t to the doorl jamb c would allow the bolt 5 to move and the'contact fingers 8 would engage the contact posts 9, being urged 'to assirae said position under influence ot the spring member 14. It is thus evident that il a switch oit this character were utilized, every movement ot the lock bolt would operate the switch and consequently operate any alarm system associated therewith, such as the light av or the audible member Z). This ot course not to be desired. and a result further means e are provided tor the very purpose of over'- coming this undesirable ieature. T he means c may include a tumbler or pin 2ln received within an opening in the bolt 5. Said bolt 5 is chambered as at so as to conline the pin 21a and likewise a coil spring 2li surrounding said pin and engagng one oit the chamber walls and likewise enqagiim` a pertion of the pin. rlhe bolt 5 is provited with a longitudinal bore 25 wit-hin which bore confined a member 26 Jformed with a l'ey slot 27. Upon inserting'a key 28 within the ke,

slot 27 and turning said key, a portion ot said key will engage a flange or collar 29 which will litt the pin 21, The base o'l the casing 1 is provided with two spaced notches 30 and 31, and the pin 21EL may engage either one or the other ot said notches Jfor the purpose ot holding the bolt 5 in such a position that the contact ngers 8 may not engage the posts 9 or be in such a position that the ngers may engage the posts. Assume that the door nas been closed the bolt 12 shot, we will then have the parts in the position illustrated in Figure 1. It then the bolt 12 is released the bolt 5 will slide withinV the casing 1 under the urging influence ot the spring` 1e and cause the arms 8 to engage the posts 9 and the pin 21;L will engage the notcu 31, as illustrated in l gui-e ns. f alle v2, Gbviously then the bolt 5 cannot be pushed back to disengage the contact arms trom the posts 9, toe switch is locked in a closed position. it a prop f 2S is then inserted throughthe hey slot 2T and turned,

the pin 21a may be lifted and an inward pushing of the key will allow the bolt to be pushed backward within the casing so that the arms 8 will disengage the posts 9. The means CZ will move upwardly and engage the notch 19 and hold the bolt cocked, as it were, or a tur-her inward movement of the bolt will allow the pin 21a to engage the notch 30 so that the bolt 5 will not` be shot, irrespective of movement ot the lock bolt 12. To release the pin 21" troni the notch 30 only requires an insertion oit the key 2S so as to litt the pin trom the notch, whereupon either the end 11 or the notch 19 may engage the means d. 1t is then possible to assume two positions ot the switch member A, one to be utilized during the day time, it desired, whereby person may pass in and out of the door without operating the switch memser, or it may be so set as to operate the switch member each time the bolt 12 is released troti the door jamb. Various electrical circuits may be utils/cd with the switch member, but v, have illustrated in Figure 1 ne circuit which has proved useful. A 'circuit wire 32 may pass to a terminal ot the light a with the other terminal ot the light a grounded as at 323. A conductor likewise connects with the circuit wire 32 passing to a terminal ot a retarded relay while the other terminal of said relay is grounded as at and likewis connects with a terminal ot a source ot current supply 36, the second terminal ot said source ot current supply connecting` with a conductor 3T. The conductor 3T has a switch interposed therein, as at 38 and connects with the second post 9 shown at The conductor 3.7 connects with an armature ot the relay f. Movement ol the armature causes the same to complete a circuit Jthrough a conductora() leading to a terminal ot the bell member Zi, the second terminal ot said bell member being grounded as 11. rlhe lingers 8 will complete a circuit` between the posts 9 and first operate the light ci. rlhe relay may be so adjusted as to operateatter a given time interval so that tampering with or moving the bolt 12 so as to cause'n'iovement of the bolt sulicient to cause the fingers 8 to engage the posts 9, will first operate the light a and then operate the audible signal o. It then, the movement ot the bolt 12 were lawful it would be a simple matter to open the door, insert the proper key within the slot 27' turning the same to disengage the pin 21a from the notch 31, push the bolt 5 back to where the means (Z would engage the notch 19 to hold the bolt in position until the lock bolt 12 were shot, without operating the bell or audible signal Z). It the tan'ipering with the bolt1 however, were unlawful, the light a would turn on and the intruder' possibly being unaware of the audible signal or switch A would not attempt to move the bolt 5 thereof, nor would he succeed in moving it unless he had a proper key, and hence the audible signal would operate at a given time, dependent upon a setting of the retarded relay f. In one adaptation ofthe invention the same key that opens the main lock of the door might be utilized for setting the switch A. However, it would be fpreferable to utilize, say, a switch member' A for the rear or back door, and a second switch member` -A for vthe front door. The key that operates the main door lock for the back door might be utilized for setting the switch A of the front door, while the main key for the front door lock could be utilized for sett-ing the switch A for the rear door. This would necessitate but two keys and no confusion would ever arise by this means.

It is obvious that many changes and variations and modifications may be made in practicing the invent-ion, in departure from the particular description herein or the showing in the drawing, without departing from the true spirit of the invention or the scope of the appended claims.

Having thus disclosed our invention, we claim and desire to secure by Letters Patent:

l. A switch device adapted to be placed in a door jamb and to have a part thereof contact at times with a lock bolt in a door, said switch including a casing, a springimpelied bolt within said casing, a switch Yarm carried by said bolt and posts mounted on said casing and adapted to be bridged by said switch arm dependent upon movenient of the bolt, said bolt being formed adjacent one end with a notch and with a cam face, a resiliently actuated detent carried by the casing and normally engaging said notch, and means 'for locking the said spring-impelled bolt to maintain the switch arm in bridging engagement between the posts or spaced from said posts, and wherebv when the lock bolt is moved inwardly of the door jamb the same releases the detent from engagement with said notch, movement of the lock bolt in an opposite direction permitting the spring-impelled bolt to move to position to switch arm into engagement with the said posts, and to lock the said spring-impelled bolt when the switch arm is so positioned.

2. A switch device adapted-to be placed in a door jamb and to have a part thereof contact at times with a lock bolt in a door,- said switch including a casing, a spring-im pelled bolt within said casing, a'switch arm carried by said bolt and posts mounted on said casing and adapted to be bridged by said switch arm dependent upon movement of the bolt, said bolt being formed adjacent one end with a notch and with a cam face, a resiliently actuated detent carried by the casing and normally eno'aging said notch, and means for locking said spring-impelled bolt to maintain the switch arm in bridging engagement between the posts or spaced from said posts, and whereby when the lock bolt is moved inwardly of the door jamb the same releases the detent from engagement with said notch, movement of the lock bolt in an opposite direction permitting the spring-impelled bolt to move to position the switch-arm into engagement with the said posts, and to loc-k said spring-impelled bolt when the vitch arm is so positioned; said means including a locking pin carried within said spring-impelled bolt, a key-way within said spring-impelled bolt adapted t0 receive a key for operating said locking pin, and a pair of spaced recesses in said casing to receive said locking pin.

In testimony whereof, we have signed our ynames to this specification.

JOHN M. COBURN. JOHN M. MCCRARY. 

